Issue Date: February 1, 2016
Isotope Ratios Clarify Moon’s Origin
The making of our moon, according to a widely accepted theory, took place billions of years ago when a giant planetary body called Theia collided with a nascent Earth, producing debris that eventually became our planet’s satellite. Although scientists think the crash certainly occurred, they still debate the details: For example, is the moon primarily made of debris from Theia or from a mix of the two planetary bodies? One way to resolve these and . . .
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